Magnetic separator.



PATBNTED 00T. 25,1904.

J. W. CARNOCHAN.

MAGNETIC SEPARATOR.

APPLIGATION FILED Nov. 27, 190s.

v SHEETS-SHEET 1.

NO MODEL.

No. 773,246. PATENTlED OCT. 25, 1904.

J. W. GARNOGHAN.

MAGNETIC SBPARATOR.

rrmoulon FILED Nov. 2v, 190s.

N0 MODEL. ZBHBETS-BHEET 2.

mm1-zu...

UNITED STATES' Patented October 25, 1904.

PATENT OFFICE.

JOHN WV. OARNOOHAN, OF SILVERCREEK, NEW YORK, ASSIGNOR OE ONE- HALF TO ALBERT B. CHAPMAN, OF SILVEROREEK, YORK.

MAGNETIC 'sl-:PARATOR SPECIFICATION forming part of Letters Patent No. 773,246, dated October 25, 1904.

Application filed November 27,1903. Serial No. 182,759. (No model.)

To all wir/0m t may concern:

Be it known that I, JOHN W. OARNOCHAN, a citizen of the United States, residing at Silvercreek, in the county of Chautauqua and State of New York, have invented new and useful Improvements in Magnetic Separators, of which the following is a specification.

This invention relates to a magnetic separator which is more particularly designed for removing magnetic particles from coffee preof two sheets, Figure l is a sectional elevation showing my improved magnetic separator applied to the hopper of a coffee-grinding mill. Fig. 2 is a detached bottom plan view of the separator. Fig. 3 is a detached side elevation thereof. Fig. 4. is a horizontal section in line 4 e, Eig. l.

Similar letters of reference indicate corresponding parts throughout the several views.

A represents the hopper of a mill for grinding coffee or similar material. This hopper is preferably circular and tapers downwardly from its inlet toward its outlet in the form of an inverted bell. The magnetic separator is fitted into this hopper so that the same can be readily removed for cleaning and is constructed as follows:

B represents a funnel arranged within the hopper and engaging its upper or large end with the downwardly-tapering interior thereof, whereby the funnel is wedged in the hopper for producing a tight fit 'between these parts and also supporting the separator within the hopper.

O represents a downwardly-haring annular flange arranged around the small lower or outlet end of the funnel.

D represents a cylindrical casing surrounding the fiange and the lower part of the funnel and extending below the iiange. This casing may be secured to the funnel and flange in any suitable manner.

E E' represent a plurality of inclined magnets arranged in an annular row or series around the outlet of the funnel. Two pairs of magnets of horseshoe form are preferably employed, the magnets E E of one pair being arranged on diametrically opposite sides of the conduit immediately below the iiange of the funnel, while the magnets E E of the other pair are likewise arranged .on diametrically'opposite sides of the conduit, but at right-angles to the upper magnets E E and below the plane thereof. The several magnets are inclined inwardly and have their poles arranged at their inner ends forming adownwardly tapering skeleton throat, through which the material Hows from which the magnetic impurities are to be removed. The upper magnets preferably extend through openings f in the lower part of the casing.v The lower magnets extend across the lower edge of the casing, and each of the magnets is secured by a screw g and retaining-plate g to a block L on the outer Side of the casing.

As the coffee or other material issues from the lower end of the funnel it is spread by means of a downwardly-Haring cone I, arranged in the outlet of the funnel. This cone is preferably somewhat larger in diameter Athan the outlet of the funnel, and means are provided whereby the cone may be raised and lowered for varying the area of said outlet and adjusting or controlling the ow of material, as may be required. The adjusting device preferably consists of an upright rod carrying the cone at its lower end and guided in upper and lower cross-bars j j', secured to the funnel, and thumb-screw nuts 7c c, arranged on the threaded part of 'the adjustingrod above and below the upper cross-bar j. The stream of material upon being spread by the cone strikes the inner side of the fiange and casing and is directed by the same toward the outer parts of the magnets. Upon striking the magnets the material is again deflected inwardly by the same and then discharged downwardly through the spaces between the magnets. As the material passes over or close to the magnets any magnetic impurities-such as nails, screws, or pieces of iron-are attracted by the same and prevented from discharging with the material to be ground. rlhe impurities which are collected by the magnets may be removed therefrom by taking the magnetic separator out of the hopper, which can be done very readily, at suitable intervals.

inasmuch as the material is directed by the spreading-cone against the outer part of the magnets, where the sameare comparatively weak, the magnetic impurities do not become securely attached to the magnets at this place and are liable to be swept off by the stream of material. Vln order to prevent this, shields or guard-plates L, of non-magnetic material, are secured to the under side of the magnets. Each of the shields extends across the weak outer part of its magnet, but stops short of the poles or strong inner part of the same. lf the stream of materia-l dislodges any magnetic impurities from the weak part of the magnets, the same are directed by the shields toward the strong' parts of the same, where the impurities become lirmly attached to the magnets and resist any dislodging eliect of the stream of material.

For the sake of simplifying the construction the shields L are made in one piece with the plates f/,whereby the magnets are secured in place, as shown in the drawings.

By first directingI the stream of material outwardly and then inwardly the same moves in a tortuous path through the separator, whereby the material is tlioroughly agitated and all parts of the same are exposed tothe action of the magnets for effectually removing all magnetic impurities therein.

l claim as my invention*i l. The combination with a downwardly-tanel, and an annular row of magnets arranged to form a downwardly tapering' skeleton throat below said iiange, substantially as set forth.

3. Amagnetic separator comprisinga downwardly-tapering funnel, and two pairs of mag nets arranged in an annular series around the outlet of said funnel and inclined to form a downwardly-tapering skeleton throat, the magnets of one pair being arranged on diametrically opposite sides of said throat, while the magnets of the other pair are also arranged on diametrically opposite sides of the throat but at right angles and in a lower plane relatively to the first-mentioned pair of magnets, substantially as set forth.

4. A magnetic separator comprising a downwardly-tapering funnel, a plurality of permanent magnets arranged at an angle in an annular row around the outlet of saidfunnel, and non-magnetic shields applied to said magnets in rear of the poles thereof and operating to direct the material from the neutral to the active parts of said magnets, substantially as set forth.

5. A magnetic separator comprising a funnel, a downwardly-flaring iiange arranged around the outlet of the funnel, a cylindrical casing surrounding the fiange and the lower part of the funnel and extending below the liange, a downwardly-flaring cone arranged in the outlet of the hopper, two pairs of inclined horseshoe-magnets mounted on said casing and arranged to form a downwardlytapering annular row around said flange, the magnets of one pair being arranged diametric ally opposite each other and the magnets of the other pair being also arranged diametrically opposite each other and below the plane of the lirst-mentioned pair, and non-magnetic shields secured to the under side of said magnets, substantially as set forth.

Witness my hand this 20th day of November, 1903.

JOHN CARNOGHAN.

/Vitnesses:

FRED. W. THOMAS, ALBERT B. CHAPMAN. 

